Default Music playerGeneral

Lately my car Bluetooth automatically connects to my phone and the default music player automatically starts playing. Before I used to have winamp automatically connect and play. How can I change this?
I tried uninstalling and re-installing winamp. Looked at make as default player but can't select.
This also happens when playing from winamp and get a call through bluetooth, once call disconnected default player starts playing instead of winamp. very Annoying
have the latest firmware 4.0.2.A.0.42
TIA